Numerical Simulation to Air Distribution in Air-conditioned Hard Sleeper Compar tment
Zhang Dengchun(1,2),Zou Shenghua(1),Weng Peifen(2)
(1 School of Energy and Safety Engineering, Hunan University of Science and Tech nology, Xiangtan, 411201, China)
(2 Shanghai Institute of Appl. Math. and Mech., Shanghai University, Shanghai 200072, China)

Abstract: The CFD model for airflow, temperature fields and thermal comfort evaluation is established in air-conditioned hard sleeper compartment, where the steady incompressible Reynolds-averaged Navier-Stokes equations are investigated with control volume method and interlacing discrectization grid. Based on the airflow and temperature fields, the thermal comfort in the chamber is evaluated. It indicates that PMV distributions in the middle and at the end of the chamber are different, The thermal comfort at the end is more satisfied than that in the middle. The passengers feel slightly cooler in the upper berth with PMV<-1.0, the passengers feel well in the middle berth with -0.5<PMV<0.5, and the passengers feel little warmer in the lower berth with PMV>1.0 owing to the lower air speed velocity and higher temperature nearby.
Keywords: hard-sleeper compartment, air distribution, computational fluid dynam ics（CFD）, numerical simulation.